206 results on '"Temerdashev, Z. A."'
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2. Assessment of Quality and Region of Origin of Wines
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Temerdashev, Z. A., Abakumov, A. G., Kaunova, A. A., Shelud’ko, O. N., and Tsyupko, T. G.
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- 2023
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3. QuEChERS Extraction of PAHs from Various Soils and Sediments Followed by Chromatographic Determination
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Temerdashev, Z. A., Ovsepyan, S. K., Musorina, T. N., Vasileva, L. V., Vasilev, A. M., and Korpakova, I. G.
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Gas chromatography -- Usage ,Soils -- Analysis ,Extraction (Chemistry) -- Methods -- Analysis ,Mass spectrometry -- Usage ,Polycyclic aromatic hydrocarbons -- Identification and classification ,Sediments (Geology) -- Analysis ,Chemistry - Abstract
We studied the features of PAHs extraction by QuEChERS in the sample preparation of soils and bottom sediments of various compositions followed their determination by gas chromatography-mass-spectrometry. The test samples were soils of sandy, loamy sand, loamy, and clayey types and bottom sediments of loamy sand type. The mineralogical composition and organic matter content of the samples were used to predict how PAHs were retained by the soils and sediments. The impact of ultrasonic treatment on analyte extraction with subsequent identification by chromatography was assessed. No ultrasonic treatment was required to extract and determine all PAHs (up to 100%) in sandy and loamy sand soils and low-molecular-weight PAHs in all test samples. The QuEChERS extraction and determination of high-molecular-weight PAHs in clay type soil samples and loamy sand bottom sediments required a 10-min ultrasonic treatment, while the recoveries of analytes were higher than 87 and 90%, respectively. The analysis of a loamy soil sample with a high organic matter content was the most challenging. To extract over 70% of high-molecular-weight PAHs from a sample of this type using the QuEChERS technique, the binary acetonitrile-acetone (1 : 1) extractant rather than conventional acetonitrile was used with the simultaneous 15-min ultrasonic treatment., Author(s): Z. A. Temerdashev [sup.1] , S. K. Ovsepyan [sup.1] , T. N. Musorina [sup.1] , L. V. Vasileva [sup.1] , A. M. Vasilev [sup.1] , I. G. Korpakova [sup.1] [...]
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- 2023
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4. Comparative Analysis of Chemical Compositions of Mentha L. Plant Extracts by Gas Chromatography-Mass Spectrometry after Hydrodistillation and Subcritical Extraction
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Nazarova, D. V., Temerdashev, Z. A., Vinitskaya, E. A., Kiseleva, N. V., and Nagalevskii, M. V.
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Gas chromatography -- Usage ,Materia medica, Vegetable -- Composition -- Comparative analysis ,Extraction (Chemistry) -- Methods ,Mass spectrometry -- Usage ,Distillation -- Methods ,Essences and essential oils -- Composition -- Comparative analysis ,Peppermint -- Composition -- Comparative analysis ,Plant extracts -- Composition -- Comparative analysis ,Chemistry - Abstract
The results of a study of the composition of essential oil and extracts obtained by hydrodistillation and subcritical extraction from plants of the genus Mentha L. are presented. The test samples were peppermint (Mentha piperita L.) and horsemint (Mentha longifolia L.). Gas chromatography-mass spectrometry was used to identify and compare the component composition of essential oils and extracts from Mentha L. plants. The composition of the essential oil of horsemint differs from the essential oil of peppermint by the high concentration of linalool and the absence of pulegone and piperitone. The component composition of the extracts of peppermint and horsemint, obtained under conditions of subcritical extraction with water and acetone, was studied. The concentration of monoterpenes, sesquiterpenes, and esters increased in the transition from the essential oil to the acetone subcritical extract of both types of mint. In the water extract of peppermint, there were practically no sesquiterpenoids or esters; there was a general decrease in the yield of all components compared to the essential oil and acetone extract., Author(s): D. V. Nazarova [sup.1] , Z. A. Temerdashev [sup.1] , E. A. Vinitskaya [sup.2] , N. V. Kiseleva [sup.1] , M. V. Nagalevskii [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 [...]
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- 2023
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5. Chromatographic Assessment of the Concentration of Phenolic Compounds in Wild Chamomile (Matricaria chamomilla L.) Extracts Obtained under Various Extraction Conditions
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Temerdashev, Z. A., Chubukina, T. K., Vinitskaya, E. A., and Kiseleva, N. V.
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Materia medica, Vegetable -- Composition -- Properties ,Phenols -- Analysis -- Measurement ,Extraction (Chemistry) -- Methods ,Mass spectrometry -- Usage -- Methods ,Chamomile -- Composition -- Properties ,High performance liquid chromatography -- Usage ,Plant extracts -- Composition -- Properties ,Chemistry - Abstract
Results of a study of water and water-alcohol extracts of wild chamomile (Matricaria chamomilla L.) depending on the conditions of their extraction by different methods are discussed. The test samples are wild chamomile samples collected in various regions of Russia. Phenolic components in their native forms were extracted from medicinal raw materials using infusion, maceration, microwave-assisted, ultrasound-assisted, and subcritical extraction, and by the pharmacopoeial method. Concentrations of individual components and total phenolic compounds in wild chamomile were determined by chromatographic methods. The HPLC determination of phenolic compounds with diode-array and mass spectrometric detection was carried out using gradient elution with a mixture of acetonitrile with 0.1% formic acid. Chlorogenic acid, ferulic acid glycosides, luteolin-7-O-glucoside, dicaffeoylquinic and chicoric acid, apigenin-7-glucoside, and apigenin were identified in water and water-alcohol extracts of wild chamomile. The dependence of the concentration of phenolic compounds on the geographical place of the growth of plant raw materials was studied based on value of this parameter in extracts of wild chamomile samples from different territories. The maximum total concentration of phenolic compounds (10.1 mg/g) was found in the extract of chamomile from FarmaTsvet (Krasnogorsk, Moscow oblast)., Author(s): Z. A. Temerdashev [sup.1] , T. K. Chubukina [sup.1] , E. A. Vinitskaya [sup.1] [sup.2] , N. V. Kiseleva [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban [...]
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- 2023
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6. Determination of Viscosity Improvers and Detergent Additives in Synthetic Motor Oils by Gel Permeation Chromatography
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Temerdashev, Z. A., Ivanova, Yu. A., Litvinenko, D. A., and Makhotkina, D. A.
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Extraction (Chemistry) -- Usage -- Methods ,Gel permeation chromatography -- Usage ,Detergents, Synthetic -- Identification and classification ,Chemistry - Abstract
We proposed a procedure for the simultaneous determination of viscosity improvers and detergent additives in synthetic oils by gel permeation chromatography, including the preliminary liquid extraction of polar additives, solid-phase extraction of polymer additives on silica modified with magnesium oxide from oil raffinate, and the subsequent determination of analytes. The procedure was used to determine viscosity improvers and detergent additives in fresh and used synthetic motor oils, to control the quality of oils at different stages of operation, and to monitor the degree of purification of oils during their regeneration. In-process monitoring of additive concentrations during the operation of automotive equipment enables the timely control of the dynamics of engine oil degradation throughout its use and proper recommendations for its replacement in the system. The procedure was tested in the analysis of fresh and used multigrade synthetic motor oils Shell Helix Ultra 5W-30 and TP MAX Total 10W-40 and fresh multigrade synthetic motor oil Shell Rimula R5M 10W-40., Author(s): Z. A. Temerdashev [sup.1] , Yu. A. Ivanova [sup.1] , D. A. Litvinenko [sup.1] , D. A. Makhotkina [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Department of [...]
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- 2023
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7. Determination of Phenolic Compounds in Hypericum perforatum L. Aqueous Extracts by Gas Chromatography-Mass Spectrometry Using Solid-Phase Analytical Derivatization
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Temerdashev, Z. A., Vinitskaya, E. A., and Korobkova, V. V.
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Gas chromatography -- Usage -- Methods ,Materia medica, Vegetable -- Identification and classification -- Composition ,Phenols -- Identification and classification -- Spectra ,Mass spectrometry -- Usage -- Methods ,St. John's wort -- Identification and classification -- Composition ,Plant extracts -- Identification and classification -- Composition ,Chemistry - Abstract
We studied the gas chromatographic determination and identification of phenolic compounds in aqueous extracts of St. John's wort (Hypericum perforatum L.) using solid-phase analytical derivatization in the sample preparation for analysis and mass spectrometric detection. A comparative analysis of the results of the determination of phenolic compounds using conventional analytical derivatization in solution and solid-phase analytical derivatization in aqueous extracts of St. John's wort showed that the preparation of derivatives on an adsorbent shortens sample preparation, minimizes the volume of the extract, and expands the list of components to be determined. We found the optimal conditions for the adsorption of phenolic substances from aqueous extracts on the Strata C18-E adsorbent and solid-phase analytical derivatization with N,O-bis(trimethylsilyl)trifluoroacetamide. Gas chromatography-mass spectrometric characteristics were determined to identify compounds in the St. John's wort aqueous extract. The results of the identification of compounds satisfactory agree with the HPLC-DAD data obtained using standard substances, allowing a conclusion that the solid-phase analytical derivatization of phenolic compounds is comparable in analytical capabilities to derivatization in solution., Author(s): Z. A. Temerdashev [sup.1] , E. A. Vinitskaya [sup.1] , V. V. Korobkova [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Department of Chemistry and High Technology, Kuban [...]
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- 2022
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8. Life Cycle of Silica Gel Adsorbents Used in Natural-Gas Purification
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Temerdashev, Z. A., Kostina, A. S., Ryadno, E. G., Vasilev, A. M., Vasileva, L. V., and Kolychev, I. A.
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- 2022
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9. Determination of Polycyclic Aromatic Hydrocarbons in Soils and Bottom Sediments by Gas Chromatography-Mass Spectrometry with QuEChERS Sample Preparation
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Temerdashev, Z. A., Musorina, T. N., Ovsepyan, S. K., and Korpakova, I. G.
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Ultrasonic waves ,Gas chromatography ,Mass spectrometry ,Polycyclic aromatic hydrocarbons ,Sediments (Geology) ,Chemistry - Abstract
The work is dedicated to the determination of polyaromatic hydrocarbons (PAHs) in soils and bottom sediments by gas chromatography-mass spectrometry using sample preparation with the extraction of analytes into a solvent and the simultaneous purification of the extracts by dispersive solid-phase extraction (QuEChERS). The test samples were samples of sand, loamy soil, and silty bottom sediments, and 20 PAHs were used as analytes. To minimize matrix effects, sample preparation conditions were optimized, and the effect of ultrasound on the extraction of analytes was studied. The recovery of PAHs from sand and silty bottom sediments varied within 80-105%, and from loamy soils, it was 60-99%. PAHs were identified and quantified by gas chromatography-mass spectrometry with detection in the selected ion monitoring mode. The QuEChERS sample preparation contributes to a prolonged life of the equipment while maintaining the sensitivity of analyte detection. The procedure was tested using a soil sample collected at the territory of the Taman Bulk Cargo Terminal (Russia)., Author(s): Z. A. Temerdashev [sup.1], T. N. Musorina [sup.1], S. K. Ovsepyan [sup.1], I. G. Korpakova [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban State University, , 350040, [...]
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- 2022
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10. GC-MS determination of polychlorinated biphenyls in water using extractive freezing-out of analytes
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Chervonnaya, T. A., primary, Musorina, T. N., additional, Temerdashev, Z. A., additional, Bekhterev, V. N., additional, and Korpakova, I. G., additional
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- 2024
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11. Determination of Sizes of Silver Nanoparticles in an Aqueous Dispersions by Single Particle Inductively Coupled Plasma Mass Spectrometry
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Temerdashev, Z. A., Galitskaya, O. A., Bol'shov, M. A., and Romanovskii, K. A.
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Nanoparticles -- Analysis ,Silver -- Analysis ,Mass spectrometry -- Analysis ,Chemistry - Abstract
Specific features of the choice of conditions for determining the sizes of silver nanoparticles in aqueous dispersions by single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) are discussed. It is shown that the limiting factors for determining the sizes of analyte nanoparticles are the degree of sample dilution and the dwell time under optimized operating conditions of the mass spectrometer. The reliable determination of the sizes of silver nanoparticles of 60 and 100 nm at the duration of an analysis of 60 and 180 s, respectively, was achieved at a concentration of 2-4 ng/mL. A possibility of predicting dwell time for nanoparticles of a known size is demonstrated. The determination of several average sizes of nanoparticles is shown on an example of a polydisperse mixture of silver nanoparticles with sizes of 60 and 100 nm at a 10 ms dwell time., Author(s): Z. A. Temerdashev [sup.1], O. A. Galitskaya [sup.1], M. A. Bol'shov [sup.2], K. A. Romanovskii [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban State University, , 350040, [...]
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- 2022
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12. Possibilities and Limitations of Solid-Phase and Liquid Extraction for the Determination of Polycyclic Aromatic Hydrocarbons in Environmental Samples
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Temerdashev, Z. A., Musorina, T. N., Chervonnaya, T. A., and Arutyunyan, Zh. V.
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United States. Environmental Protection Agency ,Polycyclic aromatic hydrocarbons ,Chemistry - Abstract
The review systematizes data on various extraction techniques for sample preparation in the determination of polycyclic aromatic hydrocarbons (PAHs) in environmental samples, provides a classification, and describes the capabilities of these techniques. The main versions and methods of solid-phase extraction (SPE) and liquid-liquid (LLE) extraction of structurally different PAHs from complex multicomponent systems are discussed. The variety of SPE and LLE methods, the peculiarities of their combinations with other methods, and the advantages and disadvantages of each sample preparation method are demonstrated. Chromatographic methods are preferred for detection after the solid-phase or liquid-liquid extraction of PAHs from environmental samples., Author(s): Z. A. Temerdashev [sup.1], T. N. Musorina [sup.1], T. A. Chervonnaya [sup.1], Zh. V. Arutyunyan [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban State University, , 350040, [...]
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- 2021
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13. Methodological Features of the Spectrophotometric Determination of Proteins in Biological Fluids Using Reactions with Brompyrogallol Red
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Pochinok, T. B., Anisimovich, P. V., and Temerdashev, Z. A.
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- 2021
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14. Assessment of the Concentrations of Isoflavonoids in Red Clover (Trifolium pratense L.) of the Fabaceae Family Using Extraction by Different Methods
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Temerdashev, Z. A., Chubukina, T. K., Vinitskaya, E. A., Nagalevskii, M. V., and Kiseleva, N. V.
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Mimosaceae -- Methods ,Legumes -- Methods ,High performance liquid chromatography -- Methods ,Isoflavones -- Methods ,Beans -- Methods ,Chemistry - Abstract
We performed a chromatographic evaluation of the recoveries of native forms of the main isoflavonoids from different morphological parts of red clover (Trifolium pratense L.) into water-alcoholic extracts using various extraction methods. Water-alcoholic extracts from red clover, obtained by maceration, microwave, ultrasonic, subcritical, and pharmacopoeial methods, were analyzed. Formononetin (0.260 mg/g) and genistein (0.051 mg/g) were maximally extracted from inflorescences of red clover by maceration; bioch-anin A was extracted by subcritical extraction (0.340 mg/g), and daidzein was extracted by ultrasonic method (0.034 mg/g). The conditions for the HPLC determination of daidzein, genistein, formononetin, and biochanin A in water-alcoholic extracts from red clover were optimized. The concentrations of isoflavonoids in various morphological parts of red clover were determined. The maximum total amount of isoflavonoids (0.190 mg/g) was observed in the water-ethanol extract from inflorescences., Author(s): Z. A. Temerdashev [sup.1], T. K. Chubukina [sup.1], E. A. Vinitskaya [sup.1], M. V. Nagalevskii [sup.1], N. V. Kiseleva [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban [...]
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- 2021
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15. Chemometric Estimation of the Contributions of Metals and Volatile Compounds to the Sensory Properties of Some Natural Grape Wines
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Khalafyan, A. A., Temerdashev, Z. A., Abakumov, A. G., and Yakuba, Yu. F.
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Metals -- Comparative analysis ,Degassing of metals -- Comparative analysis ,Wine -- Comparative analysis ,Chemistry - Abstract
Based on the concentrations of metals and volatile compounds in red and white wine samples and using linear and general linear models, we performed a comparative analysis of their contributions to the formation of sensory properties, the consolidated characteristic of which is the average value of sensory estimates given by experts. The contribution of volatile compounds to the sensory estimates exceeded that of metals by more than two times for red wines and more than three times for white wines. For red wines, the contributions of metals and volatile compounds to the variability of sensory estimates are approximately equal, and in the case of white wines, the contribution of volatile compounds is much higher than the contribution of metals. The constructed models can be used to predict sensory estimates of red and white wines based on the concentrations of volatile compounds and metals., Author(s): A. A. Khalafyan [sup.1], Z. A. Temerdashev [sup.1], A. G. Abakumov [sup.1], Yu. F. Yakuba [sup.2] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Department of Chemistry and High [...]
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- 2021
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16. A Chemometric (Geometric) Approach to Ranking Dry White Wines by the Results of Sensory Evaluation of Their Quality
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Khalafyan, A. A., Temerdashev, Z. A., Abakumov, A. G., and Yakuba, Yu. F.
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Wine -- Rankings -- Analysis ,Chemistry - Abstract
We consider the ranking of dry white wines and their quality using sensory evaluation from the standpoint of multidimensional analysis when the test samples are presented as points of a multidimensional space with coordinates corresponding to expert scores. The degree of preference between the wine samples is expressed in terms of the similarity of sensory estimates, evaluated by the geometric distance between them. In addition to ranking wines, this approach allowed us to study their cluster structure and reveal three groups of homogeneous wines based on the results of a set of expert scores given to them. A correlation the cluster structure of wines with their places in the ranked list is found. The consistency of wine ratings based on the proposed chemometric approach, arithmetic mean, and median scores is demonstrated. From the point of view of multivariate analysis, rating wines by the geometric distance is mathematically more reasonable, because it is built in accordance with the Euclidean metric, and the sum of coordinates of points, the calculation of the arithmetic mean is based on, does not correspond to any of the known metrics. Another advantage of the geometric approach is that the use of the arithmetic mean for the final assessment of the tasting results is justified at a great number of experts., Author(s): A. A. Khalafyan [sup.1], Z. A. Temerdashev [sup.1], A. G. Abakumov [sup.1], Yu. F. Yakuba [sup.2] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Department of Chemistry and High [...]
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- 2021
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17. Catalytic Activity of Alumina-Modified Silica Gels in Methanol Conversion to Dimethyl Ether
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Temerdashev, Z. A., Kostina, A. S., Rudenko, A. V., Kolychev, I. A., and Vasil’ev, A. M.
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- 2021
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18. Preconcentration of Phenolic Compounds on Carbon Sorbents and Their Chromatographic Determination in Aqueous Extracts of Medicinal Plants
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Temerdashev, Z. A., Vinitskaya, E. A., Milevskaya, V. V., and Statkus, M. A.
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Chromatography -- Usage ,Bioflavonoids -- Usage ,Flavones -- Usage ,Medicine, Botanic -- Usage ,Medicinal plants -- Usage ,Medicine, Herbal -- Usage ,Flavonoids -- Usage ,Chemistry - Abstract
A possibility of using carbon sorbents for the extraction, preconcentration, and chromatographic determination of phenolic substances of plant origin is investigated. A method is proposed for the preconcentration of biologically active substances from extracts of medicinal plants with carbon sorbents followed by the desorption of analytes with organic solvents at elevated temperature and pressure. Some sorption characteristics of carbon materials Supelclean ENVI-Carb and HyperSep Hypercarb in relation to phenolcarboxylic acids and flavonoids isolated from aqueous extracts of St. John's Wort Hypericum perforatum L. are studied. The conditions of the sorption and desorption of analytes of various classes are optimized. A possibility of using carbon sorbents for the extraction and preconcentration of phenolic substances from aqueous extracts of various medicinal plants is shown using an examples of creeping thyme Thymus serpyllum L. and sage Salvia officinalis L., Author(s): Z. A. Temerdashev [sup.1], E. A. Vinitskaya [sup.1], V. V. Milevskaya [sup.1], M. A. Statkus [sup.2] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Kuban State University, , 350040, [...]
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- 2021
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19. Identification and Determination of the Components of Garden Sage (Salvia officinalis L.) Essential Oil, Isolated by Different Extraction Methods
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Temerdashev, Z. A., Milevskaya, V. V., Ryabokon', L. P., Latin, N. N., Kiseleva, N. V., and Nagalevskii, M. V.
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Chemistry - Abstract
We studied the component composition of the essential oil of garden sage (Salvia officinalis L.), obtained by various extraction methods. Essential oils were obtained by hydrodistillation and subcritical CO.sub.2 extraction, supercritical fluid extraction, and subcritical extraction with solid-phase and liquid-liquid preconcentration. The components were identified by comparing the recorded mass spectra with the spectra of individual compounds and the data of the NIST07 and WILEY8 data bases. For all extraction methods, the major essential oil components were 1,8-cineole, camphor, [alpha]-thujone, [beta]-thujone, borneol, 4-terpineol, [beta]-caryophyllene, [beta]-caryophyllene oxide, and viridiflorol. The concentration of analytes in the extracts varied depending on the extraction method. In total, 104 components were identified in the extracts, of which 30 were extracted by hydrodistillation, 32 by subcritical CO.sub.2 extraction, 14 by supercritical fluid extraction, 46 and 62 by subcritical extraction with solid-phase and liquid-liquid extraction into the organic phase. An increase in the number of components in more stringent extraction methods as compared to hydrodistillation showed that, in the extracts, a deeper decomposition of macrocomponents might take place, except for camphor., Author(s): Z. A. Temerdashev [sup.1], V. V. Milevskaya [sup.1], L. P. Ryabokon' [sup.1], N. N. Latin [sup.2], N. V. Kiseleva [sup.1], M. V. Nagalevskii [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 [...]
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- 2020
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20. Determination of Polycyclic Aromatic Hydrocarbons in Soil and Bottom Sediments by Gas Chromatography-Mass Spectrometry Using Dispersive Liquid-Liquid Microextraction
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Temerdashev, Z. A., Musorina, T. N., and Chervonnaya, T. A.
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Gas chromatography -- Analysis ,Mass spectrometry -- Analysis ,Polycyclic aromatic hydrocarbons -- Analysis ,Sediments (Geology) -- Analysis ,Chemistry - Abstract
The problems and advantages of chromatographic methods for the determination of polycyclic aromatic hydrocarbons (PAHs) in model and real samples of black soil (chernozem), sand, and bottom sediments of the Sea of Azov and the Kurchansky estuary are discussed. We substantiated and implemented sample preparation for analysis using dispersion liquid-liquid microextraction. PAH concentrations in soils of various types and bottom sediments were determined by gas chromatography-mass spectrometry. The specific features of sample preparation of soil and bottom sediments are studied aimed at achieving the maximum recovery of PAHs into the organic phase; the composition of the extraction system and the conditions for the extraction of analytes are optimized; the optimal sample weight is selected. We proposed a gas chromatographic system with mass spectrometric detection (GC-MS) for determining 20 PAHs in soil (bottom sediments). The limits of quantification for the studied PAHs in soils and bottom sediments were 0.2-0.5 [micro]g/kg. The optimized procedure for the GC-MS determination of PAHs was tested on real samples of bottom sediments of the Temryuk Bay of the Sea of Azov., Author(s): Z. A. Temerdashev [sup.1], T. N. Musorina [sup.1], T. A. Chervonnaya [sup.1] Author Affiliations: (1) grid.26083.3f, 0000 0000 9000 3133, Department of Chemistry and High Technology, Kuban State University, [...]
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- 2020
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21. Hydrocarbon pollution of the Azov Sea water ecosystems and its differentiation
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Temerdashev, Z. A., Pavlenko, L. F., Korpakova, I. G., and Eletskii, B. D.
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- 2020
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22. Determination of Mercury in Sediments by Slurry Sampling Electrothermal Atomic Absorption Spectrometry
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Burylin, M. Yu., Romanovskiy, K. A., Temerdashev, Z. A., and Galai, E. F.
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- 2019
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23. Chromatographic Separation and Determination of Functional Additives in Turbine Oil
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Temerdashev, Z. A., Ivanova, Yu. A., Kolychev, I. A., Averina, E. S., Rudenko, A. V., and Zanozina, I. I.
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- 2019
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24. QuEChERS Extraction of PAHs from Various Soils and Sediments Followed by Chromatographic Determination
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Temerdashev, Z. A., primary, Ovsepyan, S. K., additional, Musorina, T. N., additional, Vasileva, L. V., additional, Vasilev, A. M., additional, and Korpakova, I. G., additional
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- 2023
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25. Comparative Analysis of Chemical Compositions of Mentha L. Plant Extracts by Gas Chromatography–Mass Spectrometry after Hydrodistillation and Subcritical Extraction
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Nazarova, D. V., primary, Temerdashev, Z. A., additional, Vinitskaya, E. A., additional, Kiseleva, N. V., additional, and Nagalevskii, M. V., additional
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- 2023
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26. Gas Chromatography-Mass Spectrometry Determination of Polycyclic Aromatic Hydrocarbons in Surface Water
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Temerdashev, Z. A., Musorina, T. N., Kiseleva, N. V., Eletskii, B. D., and Chervonnaya, T. A.
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Aquatic resources -- Russia ,Gas chromatography ,Mass spectrometry ,Polycyclic aromatic hydrocarbons ,Chemistry - Abstract
The current status and problems of the determination of polycyclic aromatic hydrocarbons (PAHs) in surface waters are discussed. Sixteen unsubstituted PAHs, which are priority pollutants of aquatic ecosystems, are selected as analytes. Gas chromatography-mass spectrometry (GC-MS) ensures the identification of the majority of pollutants using an integrated spectral library and their determation at a level below the maximum permissible concentration (MPC). The conditions for the simultaneous determination of 16 unsubstituted PAHs by GC-MS with detection in the selected ion monitoring mode are optimized. PAHs were extracted from a 1-L water sample by ultrasound-assisted liquid-liquid extraction. The main performance characteristics of the procedure were estimated. The lower limit of the analytical range was from 0.5 ng/L (benzo(a)pyrene) to 50 ng/L (naphthalene); the upper limit of the analytical range was 250 ng/L for all PAHs. The procedure was tested in model systems and real samples., Author(s): Z. A. Temerdashev [sup.1], T. N. Musorina [sup.1], N. V. Kiseleva [sup.1], B. D. Eletskii [sup.2], T. A. Chervonnaya [sup.1] Author Affiliations: (Aff1) 0000 0000 9000 3133, grid.26083.3f, Department [...]
- Published
- 2018
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27. Determination of the Wine Variety and Geographical Origin of White Wines Using Neural Network Technologies
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Khalafyan, A. A., Temerdashev, Z. A., Kaunova, A. A., Abakumov, A. G., Titarenko, V. O., Akin’shina, V. A., and Ivanovets, E. A.
- Published
- 2019
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28. Application of Statistical Methods for Classification of Varietal and Regional Origin of White Wines
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Titarenko, V. O., Khalafyan, A. A., Temerdashev, Z. A., Kaunova, A. A., and Ivanovets, E. A.
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- 2018
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29. Analytical Aspects of the Determination of the Total Concentration and Differentiation of Anthropogenic and Biogenic Hydrocarbons in Aquatic Ecosystems
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Temerdashev, Z. A., Pavlenko, L. F., Korpakova, I. G., and Ermakova, Ya. S.
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- 2018
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30. Identification of the Varietal and Regional Origin of Red Wines by Classification Analysis
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Titarenko, V. O., Khalafyan, A. A., Temerdashev, Z. A., Kaunova, A. A., and Abakumov, A. G.
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- 2018
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31. Kinetics of Extraction of Biologically Active Substances from Medicinal Plant Raw Materials using Different Techniques
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Milevskaya, V. V., Butylskaya, T. S., Temerdashev, Z. A., Statkus, M. A., and Kiseleva, N. V.
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- 2017
- Full Text
- View/download PDF
32. ICP-spectrometric determination of the total tin content in the water of the Azov and Black Seas
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Temerdashev, Z. A., Abakumov, P. G., Abakumova, D. D., Center for Collective Use «Ecological Analytical Center» of the Kuban State University, and ЦКП «Эколого-аналитический центр» Кубанского государственного университета
- Subjects
equipment and supplies ,Analytical Chemistry - Abstract
The paper considers the possibility of determining the total content of tin in various forms of presence in the waters of the Azov and Black Seas, which differ in salinity. Organotin compounds, when present in waters, interfere with the determination of inorganic forms of tin by direct injection by ICP spectrometry. It is shown that before determining the total content of tin in various forms of presence in waters with organotin compounds, microwave mineralization of the analyzed samples is required, under which a quantitative conversion to the inorganic form of tin is ensured. The highest efficiency of decomposition of water samples was achieved using oxidizing mixtures based on nitric acid (5.0 см3 HNO3; 4.0 см3 HNO3 + 1.0 см3 HCl и 3.0 см3 HNO3 + 2.0 см3 H2О2). Limits for the determination of tin (LOQSn) in solutions prepared in deionized and model sea waters with different salinities have been established. According to the proposed scheme of analysis for ICP-AES, the LOQSn values in water samples from the Azov and Black Seas were 0.40 and 0.47 µg/dm3, respectively, with direct injection of the sample. In the ICP-MS determination of LOQSn also increases with increasing water salinity and ranges from 0.03 (deionized water) to 0.45 μg/dm3 (model sea water with a salinity of 18 ‰). The developed scheme of analysis made it possible to determine the total content of tin, considering all forms of its presence in sea waters. Satisfactory convergence of the results of analyzes after microwave mineralization of waters is observed for ICP-AES determination of the total tin content in the range from 0.45 to 10.0 μg/dm3, and for ICP-MS in the range from 0.40 to 5.00 μg/dm3. In the analyzed water samples of the Azov and Black Seas, the total tin content was found to be 0.20 and 0.23 µg/dm3, respectively.Keywords: tin, organotin compounds, sea water, inductively coupled plasma atomic emission spectrometry, inductively coupled plasma mass spectrometry, microwave mineralization DOI: http://dx.doi.org/10.15826/analitika.2022.26.1.009Z.A. Temerdashev, P.G. Abakumov, D.D. Abakumova Kuban State University, Stavropolskaya st., 149, Krasnodar, 350055, Russian Federation, В работе рассмотрена возможность определения суммарного содержания олова в различных формах нахождения в водах Азовского и Черного морей, отличающихся по солености. Оловоорганические соединения при наличии в водах мешают определению неорганических форм олова прямым вводом методами ИСП-спектрометрии. Показано, что перед определением суммарного содержания олова в различных формах нахождения в водах с оловоорганическими соединениями требуется СВЧ-минерализация анализируемых образцов, в условиях которой обеспечивается количественный перевод в неорганическую форму олова. Наибольшую эффективность разложения образцов воды достигали при использовании окислительных смесей на основе азотной кислоты (5.0 см3 HNO3; 4.0 см3 HNO3 + 1.0 см3 HCl и 3.0 см3 HNO3 + 2.0 см3 H2О2). Установлены пределы определения олова (ПОSn) в растворах, приготовленных на деионизованной и модельных морских водах с различной соленостью. Значения ПОSn по предложенной схеме анализа для ИСП-АЭС в образцах вод Азовского и Черного морей при прямом вводе пробы составили 0.40 и 0.47 мкг/дм3, соответственно. При ИСП-МС определении ПОSn также повышается с ростом минерализации воды и колеблется от 0.03 (деионизованная вода) до 0.45 мкг/дм3 (модельная морская вода с соленостью 18 ‰). Разработанная схема анализа позволила определять суммарное содержание олова с учетом всех форм его нахождения в морских водах. Удовлетворительная сходимость результатов анализов после СВЧ-минерализации вод наблюдается при ИСП-АЭС определении суммарного содержания олова в диапазоне от 0.45 до 10.0 мкг/дм3, а для ИСП-МС в диапазоне от 0.40 до 5.00 мкг/дм3. В проанализированных образцах вод Азовского и Черного морей установили суммарные содержания олова, составившие 0.20 и 0.23 мкг/дм3, соответственно.Ключевые слова: олово, оловоорганические соединения, морская вода, атомно-эмиссионная спектрометрия с индуктивно-связанной плазмой, масс-спектрометрия с индуктивно-связанной плазмой, СВЧ-минерализация DOI: http://dx.doi.org/10.15826/analitika.2022.26.1.009
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- 2022
33. Chromatography–mass spectrometry identification of polyaromatic hydrocarbons in thermally modified petroleum products and thermal destruction products of organic materials of various origins
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Temerdashev, Z. A., Kolychev, I. A., Musorina, T. N., and Arakel’yan, E. V.
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- 2017
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34. Determination of phenolic compounds in medicinal plants from the Lamiaceae family
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Milevskaya, V. V., Temerdashev, Z. A., Butyl’skaya, T. S., and Kiseleva, N. V.
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- 2017
- Full Text
- View/download PDF
35. РАЗДЕЛЕНИЕ ФОРМ НАХОЖДЕНИЯ ОЛОВА И ОПРЕДЕЛЕНИЕ СУММАРНОГО СОДЕРЖАНИЯ ОЛОВООРГАНИЧЕСКИХ СОЕДИНЕНИЙ В ПРИРОДНЫХ ВОДАХ РАЗЛИЧНОЙ СОЛЕНОСТИ
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Temerdashev, Z. A., Abakumov, P. G., and Abakumova, D. D.
- Subjects
Analytical Chemistry - Abstract
In the current paper, the possibility of separating inorganic and organic forms of tin occurrences has been considered and the features of determining the total content of organotin compounds (OTC) in waters with different salinities by ICP-spectrometry with hydride generation were studied. Various approaches to the separation of the chemical forms of tin by liquid-liquid extraction with various solvents, as well as by precipitation with fluorides, iodides, aqueous solutions of ammonia and iron (III) chloride at analyte concentrations at the MPC level for fishery reservoirs, have been examined. The separation of the chemical forms of tin due to the taking out the OTC by liquid-liquid extraction turned out to be inefficient because of the incomplete extraction of analytes and partial extraction (up to 15%) of the inorganic form of tin into the organic phase. Precipitation of inorganic and organic forms of tin using fluorides, iodides, ammonia, and iron (III) chloride also turned out to be inefficient. This was due to the low content of analytes, at which their quantitative precipitation was difficult. Under the conditions of high-level mineralization of sea waters, it was also unlikely that a competing reaction of changing the chloride environment to fluoride or iodide one would occur. Separation of the chemical forms of tin was achieved using the solid phase sorption. The Diapak C18 silica gel sorbent selectively extracted the organic form of tin from waters with different salinity under the optimized conditions. The optimized conditions for separating the chemical forms of tin made it possible to develop a method for determining the total content of OTC in natural waters with different salinity from the difference between the total content of the analyte and the inorganic form of tin. To determine the total content of the analyte, microwave mineralization of the water sample was carried out; the concentration of the inorganic form of tin was determined after its solid-phase separation from organotin compounds. The lower limits of analyte concentrations determined were 0.03 and 0.05 μg/dm3 for the ICP-MS and ICP-AES methods, respectively, which made it possible to separately determine the OTC during the ecoanalytical monitoring at the level below the MPC.Keywords: inorganic form of tin, organotin compounds, generation of tin hydrides, solid-phase separation, sorption, solid-phase extractionDOI: http://dx.doi.org/10.15826/analitika.2022.26.3.001 Z.A. Temerdashev, P.G. Abakumov, D.D. Abakumova Kuban State University, Stavropolskaya st., 149, Krasnodar, 350055, Russian Federation, В работе рассмотрена возможность разделения неорганических и органических форм нахождения олова, изучены особенности определения суммарного содержания оловоорганических соединений (ООС) в водах с различной соленостью методами ИСП-спектрометрии с генерацией гидридов. Изучены различные подходы по разделению химических форм олова жидкость-жидкостной экстракцией различными растворителями, а также осаждением фторидами, иодидами, водными растворами аммиака и хлорида железа (III) при концентрациях аналита на уровне ПДК для водоемов рыбохозяйственного назначения. Разделение химических форм олова за счет извлечения ООС жидкость-жидкостной экстракцией оказалось неэффективным из-за неполной экстракции аналитов и частичного извлечения (до 15 %) неорганической формы олова в органическую фазу. Осаждение неорганических и органических форм олова с использованием фторидов, иодидов, аммиака и хлоридом железа (III) также оказалось неэффективным, по-видимому, это связано с низким уровнем содержаний аналитов, при которых их количественное осаждение затруднительно. В условиях высокого уровня минерализации морских вод обеспечение конкурирующей реакции изменения хлоридного окружения ООС на фторидный или иодидный также маловероятен. Разделение химических форм олова достигается с использованием твердофазной сорбции. Силикагелевый сорбент Диапак С18 в оптимизированных условиях селективно извлекает органическую форму олова из вод с различной соленостью. Оптимизированные условия разделения химических форм олова позволили разработать методику определения суммарного содержания ООС в природных водах с различной соленостью по разнице суммарного содержания аналита и неорганической формы олова. Для определения суммарного содержания аналита проводили СВЧ-минерализацию образца воды, концентрацию неорганической формы олова устанавливали после его твердофазного отделения от оловоорганических соединений. Нижние границы определяемых концентраций аналита составили 0.03 и 0.05 мкг/дм3 для методов ИСП-МС и ИСП-АЭС, соответственно, что позволяет раздельно определять ООС при проведении экоаналитического мониторига на уровне ниже ПДК.Ключевые слова: неорганическая форма олова, оловоорганические соединения, генерация гидридов олова, твердофазное разделение, сорбция, твердофазное извлечениеDOI: http://dx.doi.org/10.15826/analitika.2022.26.3.001
- Published
- 2022
36. Statistical-probability simulation of the organoleptic properties of grape wines
- Author
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Khalafyan, A. A., Yakuba, Yu. F., Temerdashev, Z. A., Kaunova, A. A., and Titarenko, V. O.
- Published
- 2016
- Full Text
- View/download PDF
37. Extraction and determination of biologically active components of St. John’s wort and its pharmaceutical preparations
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Milevskaya, V. V., Statkus, M. A., Temerdashev, Z. A., Kiseleva, N. V., Butyl’skaya, T. S., and Shil’ko, E. A.
- Published
- 2016
- Full Text
- View/download PDF
38. Preparation and properties of silica gel with immobilized formazan group
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Konshina, Dzh. N., Danilova, A. V., Temerdashev, Z. A., Bolotin, S. N., Gurinov, A. A., and Konshin, V. V.
- Published
- 2016
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- View/download PDF
39. Application of Ranging Analysis to the Quality Assessment of Wines on a Nominal Scale
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Yakuba, Yu. F., Temerdashev, Z. A., and Khalaf’yan, A. A.
- Published
- 2016
- Full Text
- View/download PDF
40. Methods for the extraction of biologically active substances from medicinal plants based on an example of St. John's wort components
- Author
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Milevskaya, V. V., Statkus, M. A., Temerdashev, Z. A., Kiseleva, N. V., and Vernikovskaya, N. A.
- Subjects
Materia medica, Vegetable -- Chemical properties -- Identification and classification ,Extraction (Chemistry) -- Methods ,St. John's wort -- Composition ,Medicinal plants -- Composition ,Plant extracts -- Chemical properties -- Identification and classification ,Chemistry - Abstract
The efficiency of extraction of biologically active substances from common St. John's wort (Hypericum perforatum L.) under varied conditions was compared in order to optimize a sample preparation procedure. The extraction with water and water-alcohol solutions under static conditions and with stirring was examined; the effect of ultrasonic treatment and extraction with water and water-alcohol mixtures under dynamic conditions at elevated temperature and pressure and the extraction with supercritical carbon dioxide were studied. It was established that, in the extraction of biologically active substances from plant materials, the chemical affinity of an extractant the extracted component is of primary importance; an increase in the pressure under dynamic conditions is the second factor in importance, which increases the efficiency of extraction. Keywords: extraction, biologically active substances, medicinal herbs, common St. John's wort (Hypericum perforatum L.), hyperforin, flavonoids DOI: 10.1134/S1061934815120126, Medicinal plants and preparations on their basis have been widely used in medicine for a long time. Quality assessment procedures for medicinal plant raw materials are regulated (for example, see [...]
- Published
- 2015
- Full Text
- View/download PDF
41. Suspension columns with grain sorbents retained in an ultrasonic field for separation and determination of rare-earth elements in wines
- Author
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Dzhenloda, R. Kh., Shkinev, V. M., Danilova, T. V., Temerdashev, Z. A., Karandashev, V. K., and Spivakov, B. Ya.
- Subjects
Separation (Technology) -- Methods ,Rare earth metals -- Chemical properties -- Identification and classification ,Wine -- Chemical properties -- Composition ,Mass spectrometry -- Methods ,Sorbents -- Chemical properties -- Identification and classification ,Chemistry - Abstract
The properties of a Diasorb-130-IDK sorbent based on silica gel with a grain size of about 6 pm were studied in order to choose conditions for the separation of the rare-earth elements from the samples of natural wine and their subsequent determination by inductively coupled plasma mass spectrometry. The possibility of the quantitative separation of the elements with the use of an ultrasonic flow suspension column was demonstrated. The results were compared with data obtained with the use of other sample preparation methods. A procedure was proposed for the determination of the rare-earth elements and yttrium in the samples of wines. Keywords: suspension columns, ultrasound, rare-earth metals, wine DOI: 10.1134/S1061934815120059, Sorption methods for the preconcentration of analytes are widely used in analytical chemistry. Various grainy sorbents are commonly used in the form of packed beds retained in a column or [...]
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- 2015
- Full Text
- View/download PDF
42. Separation of the tin finding forms and determination of the organotin compounds total content in natural waters of different salinity
- Author
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Temerdashev, Z. A., Abakumov, P. G., and Abakumova, D. D.
- Subjects
INORGANIC FORM OF TIN ,SOLID-PHASE EXTRACTION ,ОЛОВООРГАНИЧЕСКИЕ СОЕДИНЕНИЯ ,ТВЕРДОФАЗНОЕ РАЗДЕЛЕНИЕ ,ORGANOTIN COMPOUNDS ,GENERATION OF TIN HYDRIDES ,SOLID-PHASE SEPARATION ,ГЕНЕРАЦИЯ ГИДРИДОВ ОЛОВА ,НЕОРГАНИЧЕСКАЯ ФОРМА ОЛОВА ,СОРБЦИЯ ,SORPTION ,ТВЕРДОФАЗНОЕ ИЗВЛЕЧЕНИЕ - Abstract
В работе рассмотрена возможность разделения неорганических и органических форм нахождения олова, изучены особенности определения суммарного содержания оловоорганических соединений (ООС) в водах с различной соленостью методами ИСП-спектрометрии с генерацией гидридов. Изучены различные подходы по разделению химических форм олова жидкость-жидкостной экстракцией различными растворителями, а также осаждением фторидами, иодидами, водными растворами аммиака и хлорида железа (III) при концентрациях аналита на уровне ПДК для водоемов рыбохозяйственного назначения. Разделение химических форм олова за счет извлечения ООС жидкость-жидкостной экстракцией оказалось неэффективным из-за неполной экстракции аналитов и частичного извлечения (до 15 %) неорганической формы олова в органическую фазу. Осаждение неорганических и органических форм олова с использованием фторидов, иодидов, аммиака и хлоридом железа (III) также оказалось неэффективным, по-видимому, это связано с низким уровнем содержаний аналитов, при которых их количественное осаждение затруднительно. В условиях высокого уровня минерализации морских вод обеспечение конкурирующей реакции изменения хлоридного окружения ООС на фторидный или иодидный также маловероятен. Разделение химических форм олова достигается с использованием твердофазной сорбции. Силикагелевый сорбент Диапак С18 в оптимизированных условиях селективно извлекает органическую форму олова из вод с различной соленостью. Оптимизированные условия разделения химических форм олова позволили разработать методику определения суммарного содержания ООС в природных водах с различной соленостью по разнице суммарного содержания аналита и неорганической формы олова. Для определения суммарного содержания аналита проводили СВЧ-минерализацию образца воды, концентрацию неорганической формы олова устанавливали после его твердофазного отделения от оловоорганических соединений. Нижние границы определяемых концентраций аналита составили 0.03 и 0.05 мкг/дм3 для методов ИСП-МС и ИСП-АЭС, соответственно, что позволяет раздельно определять ООС при проведении экоаналитического мониторига на уровне ниже ПДК. In the current paper, the possibility of separating inorganic and organic forms of tin occurrences has been considered and the features of determining the total content of organotin compounds (OTC) in waters with different salinities by ICP-spectrometry with hydride generation were studied. Various approaches to the separation of the chemical forms of tin by liquid-liquid extraction with various solvents, as well as by precipitation with fluorides, iodides, aqueous solutions of ammonia and iron (III) chloride at analyte concentrations at the MPC level for fishery reservoirs, have been examined. The separation of the chemical forms of tin due to the taking out the OTC by liquid-liquid extraction turned out to be inefficient because of the incomplete extraction of analytes and partial extraction (up to 15%) of the inorganic form of tin into the organic phase. Precipitation of inorganic and organic forms of tin using fluorides, iodides, ammonia, and iron (III) chloride also turned out to be inefficient. This was due to the low content of analytes, at which their quantitative precipitation was difficult. Under the conditions of high-level mineralization of sea waters, it was also unlikely that a competing reaction of changing the chloride environment to fluoride or iodide one would occur. Separation of the chemical forms of tin was achieved using the solid phase sorption. The Diapak C18 silica gel sorbent selectively extracted the organic form of tin from waters with different salinity under the optimized conditions. The optimized conditions for separating the chemical forms of tin made it possible to develop a method for determining the total content of OTC in natural waters with different salinity from the difference between the total content of the analyte and the inorganic form of tin. To determine the total content of the analyte, microwave mineralization of the water sample was carried out; the concentration of the inorganic form of tin was determined after its solid-phase separation from organotin compounds. The lower limits of analyte concentrations determined were 0.03 and 0.05 μg/dm3 for the ICP-MS and ICP-AES methods, respectively, which made it possible to separately determine the OTC during the ecoanalytical monitoring at the level below the MPC. Исследования проводились в рамках выполнения Госзадания Минобрнауки РФ, проект № FZEN-2020-0022, с использованием научного оборудования ЦКП «Эколого-аналитический центр» Кубанского госуниверситета. Current studies were performed within the framework of the government assignment of the Ministry of Science and Higher Education of the Russian Federation, project no. FZEN-2020-0022, the experiments were carried out with the use of scientific equipment of the Environmental Analytical Center of Collective Use at the Kuban State University.
- Published
- 2022
43. ICP-spectrometric determination of the total tin content in the water of the Azov and Black seas using the hydride generation technique
- Author
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Temerdashev, Z. A., Abakumov, P. G., and Abakumova, D. D.
- Subjects
ОЛОВООРГАНИЧЕСКИЕ СОЕДИНЕНИЯ ,МАСС-СПЕКТРОМЕТРИЯ С ИНДУКТИВНО-СВЯЗАННОЙ ПЛАЗМОЙ ,ОЛОВО ,HYDRIDE GENERATION ,СВЧ-МИНЕРАЛИЗАЦИЯ ,INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY ,МОРСКАЯ ВОДА ,SEA WATER ,АТОМНО-ЭМИССИОННАЯ СПЕКТРОМЕТРИЯ С ИНДУКТИВНО-СВЯЗАННОЙ ПЛАЗМОЙ ,INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY ,TIN ,ORGANOTIN COMPOUNDS ,MICROWAVE MINERALIZATION ,ГЕНЕРАЦИЯ ГИДРИДОВ - Abstract
Рассмотрена возможность определения суммарного содержания олова в водах Азовского и Черного морей с использованием техники генерации гидридов. Проведена оптимизация условий генерации гидридов олова для последующего определения методами атомно-эмиссионной спектрометрии с индуктивно-связанной плазмой (ИСП-АЭС) и масс-спектрометрии с индуктивно-связанной плазмой (ИСП-МС). При изучении матричного влияния компонентов установлено, что переходные металлы Ni2+, Co2+, Cu2+ и Fe3+ снижают аналитический сигнал олова. Изучена возможность нивелирования влияния переходных металлов различными связывающими маскирующими агентами (L-цистеином, ЭДТА, винной кислотой, иодидом калия и тиокарбамидом), из которых наибольшую эффективность показал L-цистеин. В оптимизированных условиях анализа установлены пределы определения неорганического олова в модельных водах, составившие вне зависимости от уровня солености 0.05 и 0.03 мкг/дм3 для ИСП-АЭС и ИСП-МС, соответственно. Оценена возможность определения олова в водах с применением техники генерации гидридов, когда аналит присутствует в форме оловоорганических соединений. Показано, что для ИСП-спектрометрического определения аналита с генерацией гидридов в воде, содержащей оловоорганические соединения, требуется СВЧ-минерализация образцов. Удовлетворительную сходимость результатов анализов наблюдали при определении суммарного содержания олова в морских водах в диапазонах концентраций 0.05-2.00 и 0.03-2.00 мкг/дм3 для ИСП-АЭС и ИСП-МС, соответственно. Разработанные методики применили при определении олова в водах Азовского и Черного морей, суммарные содержания аналита в них составили 0.15 и 0.23 мкг/дм3, соответственно. The current paper considers the possibility of determining the total tin content in the waters of the Azov and Black seas using the hydride generation technique. The conditions for the generation of tin hydrides were optimized for the subsequent determination by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). When studying the matrix effect of the components, it was found that the transition metals Ni2+, Co2+, Cu2+, and Fe3+ reduce the analytical signal of tin. The possibility of leveling the influence of transition metals by various binding masking agents (L-cysteine, EDTA, tartaric acid, potassium iodide and thiocarbamide), of which L-cysteine showed the greatest efficiency, was studied. Under the optimized analysis conditions, the limits for the determination of inorganic tin in the model waters were established, which, regardless of the salinity level, were 0.05 and 0.03 μg/dm3 for ICP-AES and ICP-MS, respectively. The possibility of determining tin in waters using the hydride generation technique, when the analyte was present in the form of organotin compounds, was evaluated. It has been shown that for the ICP spectrometric determination of the analyte with the generation of hydrides in water containing organotin compounds, microwave mineralization of the samples was required. The satisfactory convergence of the analyses’ results was observed when determining the total content of tin in sea waters in the concentration ranges of 0.05-2.00 and 0.03-2.00 μg/dm3 for ICP-AES and ICP-MS, respectively. The developed methods were used to determine tin in the waters of the Azov and Black seas; the total analyte content in them was 0.15 and 0.23 μg/dm3, respectively. Исследования проводились в рамках выполнения Госзадания Минобрнауки РФ, проект № FZEN-2020-0022, с использованием научного оборудования ЦКП «Эколого-аналитический центр» Кубанского госуниверситета. Current studies were performed within the framework of the government assignment of the Ministry of Science and Higher Education of the Russian Federation, project no. FZEN-2020-0022, the experiments were carried out with the use of scientific equipment of the Environmental Analytical Center of Collective Use at the Kuban State University.
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- 2022
44. Extraction-chromatographic determination of zinc dithiophosphates in engine oils
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Temerdashev, Z. A., Kolychev, I. A., Artyukh, E. V., Kiseleva, N. V., and Zanozina, I. I.
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- 2015
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45. Correlations between the elemental composition of grapes, soils of the viticultural area and wine
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Temerdashev, Z. A., primary, Abakumov, A. G., additional, Khalafyan, A. A., additional, and Ageeva, N. M., additional
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- 2021
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46. Determination of polymeric functional additives in diesel fuel by gel penetration chromatography
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Ivanova, Yu. A., Temerdashev, Z. A., Kolychev,I. A., Kiseleva, N. V., РФФИ (проект №19-33-90175), and ЦКП 'Эколого-аналитический центр' Кубанского госуниверситета
- Subjects
POLYMER ADDITIVES ,ДЕПРЕССОРНО-ДИСПЕРГИРУЮЩАЯ ПРИСАДКА ,"KEROFLUX 3699" DEPRESSANT-DISPERSANT ADDITIVE ,ГЕЛЬ-ПРОНИКАЮЩАЯ ХРОМАТОГРАФИЯ ,ДИЗЕЛЬНОЕ ТОПЛИВО ,GEL PERMEATION CHROMATOGRAPHY ,ПОЛИМЕРНЫЕ ПРИСАДКИ ,DIESEL FUEL - Abstract
Current article is devoted to the development of a method for determining polymer functional additives and their molecular weight characteristics in diesel fuel by gel penetration chromatography. The objects of the study were solutions of “C5A”, “Maxoil D”, “Detersol”, polymethymethacrylate “D” (PMAD), “Keropur D ”, Antigel “Difron 3319” and “Superantigel” individual additives as well as the diesel fuel produced by the “Kuban Oil and Gas Company - Ilskiy Oil Refinery”, LLC. The conditions for chromatographic separation and determination of polymeric functional additives were determined considering the analyzed fuel matrix, the working range of the separated masses and molecular weights of analytes, and the composition of the eluent applicable for wide range of analytes. The chromatographic system was calibrated using the narrowly dispersed analytical standard polystyrene samples with molecular weights of 1000, 2000, 4000, 10000, 30,000, 50,000, and 70,000 Da respectively. The molecular weight characteristics were calculated for each functional additive from the analytical standard samples of polystyrene. The method of GPC determination of polymeric functional additives in diesel fuel, along with the concentration characteristics, also makes it possible to determine the molecular weight parameters of wide range of polymeric functional additives; therefore, it is promising for monitoring the quality of the diesel fuel. The proposed analytical scheme was tested in the analysis of real sample of diesel fuel. The GPC scheme for the determination of the “Keroflux 3699” depressant-dispersant additive in diesel fuel included sample preparation using the solid-phase extraction, calibration of the chromatographic system using the standard polystyrene samples, GPC determination of additive components, and the calculation of molecular weight characteristics. The molecular weight characteristics of the “Keroflux 3699” depressant dispersant additive in diesel fuel have been established - the number average and weight average molecular weights equivalent to polystyrene were 10,300 and 8800 Da respectively, and the polydispersity index of the additive was 1.17.Keywords: polymer additives, gel permeation chromatography, diesel fuel, "Keroflux 3699" depressant-dispersant additiveDOI: http://dx.doi.org/10.15826/analitika.2020.25.1.003 Yu.A. Ivanova1, Z.A. Temerdashev1, I.A. Kolychev2, N.V. Kiseleva11Kuban State University (KubSU), ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation 2Gazprom Transgaz Krasnodar, ul. Dzerzhinskogo, 36, Krasnodar, 350051, Russian Federation, Работа посвящена разработке методики определения полимерных функциональных присадок и их молекулярно-массовых характеристик в дизельном топливе методом гель-проникающей хроматографии. Объектами исследования были растворы индивидуальных присадок “С5А”, “Максойл Д, “Детерсол”, полиметиметакрилат “Д” (ПМАД), “Keropur D”, Антигель “Difron 3319”, “Суперантигель”, а также дизельное топливо производства ООО «Кубанская нефтегазовая компания – Ильский нефтеперерабатывающий завод». Условия хроматографического разделения и определения полимерных функциональных присадок определяли с учетом анализируемой матрицы топлива, рабочего диапазона разделяемых масс и молекулярных масс аналитов, состава элюента, применимого для широкого круга аналитов. Калибровку хроматографической системы проводили с использованием узкодисперсных аналитических стандартных образцов полистирола с молекулярными массами 1000, 2000, 4000, 10000, 30000, 50000 и 70000 Да. Для каждой функциональной присадки по аналитическим стандартным образцам полистирола рассчитывали молекулярно-массовые характеристики. Разработанная методика ГПХ-определения полимерных функциональных присадок в дизельном топливе, наряду с концентрационными характеристиками, позволяет определять также молекулярно-массовые показатели широкого круга полимерных функциональных присадок, что делает ее перспективной для контроля качества дизельного топлива. Предложенная аналитическая схема апробирована при анализе реального образца дизельного топлива. Схема ГПХ-определения депрессорно-диспергирующей присадки “Keroflux 3699” в дизельном топливе включала пробоподготовку с использованием ТФЭ, калибровку хроматографической системы по стандартным образцам полистирола, ГПХ определение компонентов присадки и расчет молекулярно-массовых характеристик. Установлены молекулярно-массовые характеристики депрессорно-диспергирующей присадки «Keroflux 3699» в дизельном топливе –значения среднечисленной и среднемассовой молекулярных масс эквивалентных полистиролу, которые составили 10300 и 8800 Да соответственно, а также индекс полидисперсности присадки, который составил 1.17.Ключевые слова: полимерные присадки, гель-проникающая хроматография, дизельное топливо, депрессорно-диспергирующая присадкаDOI: http://dx.doi.org/10.15826/analitika.2020.25.1.003
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- 2021
47. Capabilities and limitations of tin direct determination using the spectrometry methods with inductively coupled plasma in Azov and Black Sea waters
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Abakumova, D. D., Temerdashev, Z. A., and Abakumov, P. G.
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АТОМНО-ЭМИССИОННАЯ СПЕКТРОМЕТРИЯ С ИНДУКТИВНО-СВЯЗАННОЙ ПЛАЗМОЙ ,INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY ,МАСС-СПЕКТРОМЕТРИЯ С ИНДУКТИВНО-СВЯЗАННОЙ ПЛАЗМОЙ ,ОЛОВО ,TIN ,SEAWATER ,МАТРИЧНЫЕ ПОМЕХИ ,INDUCTIVELY COUPLED PLASMA ATOMIC EMISSION SPECTROMETRY ,МОРСКАЯ ВОДА ,MATRIX INTERFERENCE - Abstract
В работе обсуждаются возможности и ограничения ИСП-МС и ИСП-АЭС определения олова в водах Черного и Азовского морей без предварительного разделения и концентрирования аналита. Установлены условия анализа вод, влияние разбавления и матричных компонентов на результаты анализа. С повышением солености морской воды снижался наклон градуировочного графика вне зависимости от используемого метода детектирования. На образцах морской воды, характеризующихся высокой минерализацией, наблюдали значительное снижение аналитического сигнала олова. Нивелирование матричного влияния морской воды на аналитический сигнал олова достигали разбавлением образца до 100 раз. Методы позволяют определять олово при концентрациях от 0.33 мкг/дм3 (ИСП-МС), 0.37 мкг/дм3 (ИСП-АЭС) до 5 мкг/дм3 в природной (пресной) воде или морской воде с низким уровнем солености по градуировочному графику на деионизованной воде. Для ИСП-МС и ИСП-АЭС определения олова в морской воде с уровнем солености выше 6 ‰ при концентрации олова более 5 мкг/дм3 требуется использование градуировочной зависимости, построенной на модельной морской воде с учетом солености объекта. Проведенные исследования показали, что содержание олова в реке Кубань составляет 0.13 мкг/дм3. В Азовском море концентрация олова в воде, в зависимости от места отбора проб, составила менее 0.33 мкг/дм3 (г. Тамань) и 1.8 мкг/дм3 (г. Темрюк, торговый порт). В Черном море концентрация олова в образцах морской воды, отобранной в г. Новороссийске, выше и колебалась от 0.55 мкг/дм3 (набережная) до 1.5 мкг/дм3 (морской порт) и 2.1 мкг/дм3 (зерновой терминал). The current study discussed the capabilities and limitations of tin direct determination in the waters of the Black and Azov Seas using the ICP-MS and ICP-AES methods without the separation and concentration of the analyte. The conditions for the analysis of waters, the influence of dilution and matrix components on the results of the analysis were established. As the salinity of the seawater increased, the slope of the calibration curve decreased, regardless of the detection method used. The leveling of the matrix effect of seawater on the analytical signal of tin was achieved by diluting the sample up to 100 times. A significant decrease in the analytical signal of tin was observed on the samples of seawater characterized by the high salinity. These methods allowed determining tin at the concentrations ranging from 0.33 μg/dm3 (ICP-MS), 0.37 μg/dm3 (ICP-AES) to 5 μg/dm3 in natural (fresh) water or seawater with low salinity level according to the calibration curve of the deionized water. For ICP-MS and ICP-AES determination of tin in seawater with the salinity level above 6‰ and tin concentration of more than 5 μg/dm3, it was required to use the calibration dependence constructed on the model seawater considering the salinity of the object. The studies have shown that the content of tin in the Kuban River is 0.13 μg/dm3. In the Sea of Azov, the concentration of tin in the water, depending on the sampling site, was less than 0.33 μg/dm3 (Taman) and 1.8 μg/dm3 (Temryuk, commercial port). In the Black Sea, the concentration of tin in the seawater samples from Novorossiysk city was higher and ranged from 0.55 μg/dm3 (embankment) to 1.5 μg/dm3 (seaport) and 2.1 μg/dm3 (grain terminal). Данная работа выполнена с использованием научного оборудования ЦКП «Эколого-аналитический центр» Кубанского государственного университета. The research was carried out using the scientific equipment of the «Ecological Analytical Center» for Collective Use of the Kuban State University.
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- 2021
48. Sample preparation of soils and bottom sediments for gas chromatography–mass spectrometry determination of PAHs
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Temerdashev, Z. A., Chervonnaya, T. A., Musorina, T. N., Bekhterev, V. N., IChPS RAS (topic 0095-2020-0001).the Russian Science Foundation (project No. 18-73-10083)., РФФИ (№ 19-43-230003 р_а), and ЦКП 'Эколого-аналитический центр' Кубанского госуниверситета.
- Subjects
ПОЛИЦИКЛИЧЕСКИЕ АРОМАТИЧЕСКИЕ УГЛЕВОДОРОДЫ ,EXTRACTIVE FREEZING-OUT ,CHROMATOGRAPHY ANALYSIS ,POLYCYCLIC AROMATIC HYDROCARBONS ,ПОЧВЫ ,ХРОМАТОГРАФИЧЕСКИЙ АНАЛИЗ ,ЭКСТРАКЦИОННОЕ ВЫМОРАЖИВАНИЕ ,ДОННЫЕ ОТЛОЖЕНИЯ ,SOILS ,BOTTOM SEDIMENTS - Abstract
Polycyclic aromatic hydrocarbons (PAHs) are a class of compounds which have been known to be carcinogenic, teratogenic and mutagenic as well as act as pollutants of environmental objects. The determination of PAHs in complex matrices is difficult, and it is very important to use an efficient sample pretreatment technique. A sample preparation technique was developed involving extractive freezing-out and centrifugation of the samples for the determination of polycyclic aromatic hydrocarbons (PAHs) in soils and bottom sediments using gas chromatography – mass spectrometry (GC–MS). Sochi soils (The Imereti Lowlands), turf, sea bottom sediments (Azov Sea, The Temryuk Bay), river bottom sediment (Kurchansky estuary) and Caio Romano (Cuba) island sand were selected as the objects for the research. Soils and bottom sediments which contained no determined PAHs were used as model samples. The conditions of sample preparation have been optimized, and the extraction effects of acetonitrile with water on the PAHs recoveries have been investigated. It was found that for the determination of the compounds consisting from two to four fused aromatic rings such as naphthalene, 2-methylnaphthalene, acenaphthylene, biphenyl, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene and pyrene, the extraction occurred when the extractive mixture contained 15% acetonitrile. The proposed method detection limits of individual compounds ranged from 0.83 to 0.92 µg/kg. The extractive mixture containing 50% acetonitrile was proposed for the determination of 20 PAHs such as naphthalene, 2-methylnaphthalene, acenaphthene, biphenyl, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benz[a]anthracene, chrysene, triphenylene, benz[b]fluoranthene, benz[k]fluoranthene, benz[e]pyrene, benz[a]pyrene, indene[1,2,3–c,d]pyrene, dibenz[a,h]anthracene, benz[g,h,i]perylene. The extraction of PAHs in these conditions demonstrated the recoveries from 61% to 97%. As matter of fact, the lower recoveries of PAHs, that contained four or more fused aromatic rings, have been caused by the sorption in the cracks of the solid aqueous phase. The extraction, clear-up of extract and concentration were realized as one step of the sample pretreatment. As a result, the rapid and express technique of the sample preparation with combined GC-MS were proposed for the PAHs determination in soils and bottom sediments. This method’s limits of individual PAHs quantitation ranged from 1 to 5 µg/kg, and these were lower that the maximum permissible concentration.Key words: polycyclic aromatic hydrocarbons, extractive freezing-out, soils, bottom sediments, chromatography analysis.DOI: http://dx.doi.org/10.15826/analitika.2020.24.4.003Z.A. Temerdashev1, T.A. Chervonnaya1, T.N. Musorina1, V.N. Bekhterev2 1Kuban State University, ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation2 Sochi State University, ul. Plastunskaya, 94, Sochi,354000, Russian Federation, Объектами исследований были почвы (Имеретинская низменность, г. Сочи), торф (ООО «Гера», Россия), морские (Темрюкский залив Азовского моря) и речные донные отложения (Курчанский лиман, Темрюкский район), песок (о. Кайо Романо, Куба). С использованием техники экстракционного вымораживания под действием центробежных сил изучена возможность пробоподготовки исследуемых объектов для ГХ-МС-определения полициклических ароматических углеводородов. Оптимизированы условия экстракции аналитов смесью ацетонитрила с водой на образцах почв и донных отложений. Общий объем экстракционной смеси составил 10 мл при экстракционном вымораживании под действием центробежных сил при температуре морозильной камеры (-28 оС), скорости вращения ротора центрифуги 4000 об/мин для навески образца 1-2 г. «Легкие» ПАУ (нафталин, 2-метилнафталин, аценафтилен, бифенил, аценафтен, флуорен, фенантрен, антрацен, флуорантен и пирен) эффективно извлекались при 15 % ацетонитрила в экстракционной смеси с пределами их ГХ-МС-определения от 0.83 мкг/кг до 0.92 мкг/кг. Для одновременного ГХ-МС-определения 20 «легких» и «тяжелых» ПАУ, концентрация ацетонитрила в экстракционной смеси должна составлять не менее 50 %. В этих условиях степень извлечения из объектов анализа «легких» ПАУ варьировала от 83 % до 97 %, «тяжелых» – от 61 % до 92 %. Разработанная методика экспрессна, позволяет проводить извлечение аналитов и очистку экстрактов в одну стадию, а также определять ПАУ ниже установленных ПДК для изученных объектов исследования. Показатели эффективности извлечения и концентрирования ПАУ из почв и донных отложений с применением разработанной пробоподготовки сопоставили с известными альтернативными вариантами и получили удовлетворительную сходимость.Ключевые слова: полициклические ароматические углеводороды, экстракционное вымораживание, почвы, донные отложения, хроматографический анализDOI: http://dx.doi.org/10.15826/analitika.2020.24.4.003 DOI: http://dx.doi.org/10.15826/analitika.2020.24.4.003 Z.A. Temerdashev 1, T.A. Chervonnaya 1, T.N. Musorina 1, V.N. Bekhterev 2 1 Kuban State University, ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation 2 Sochi State University, ul. Plastunskaya, 94, Sochi,354000, Russian Federation
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- 2020
49. Analytical control of silicagel adsorbent contamination by the turbine oil components in the process of purifying natural gas
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Ivanova, Yu. A., Temerdashev, Z. A., Kolychev, I. A., Rudenko, A. V., Russian Foundation for Fundamental Research, project no. 19-33-90175, the Ecological and Analytical Center of the Kuban State University, РФФИ (грант №19-33-90175), and ЦКП 'Эколого-аналитический центр' Кубанского госуниверситета
- Subjects
ТУРБИННОЕ МАСЛО ,TURBINE OIL ,ADDITIVES ,REGENERATION ,NATURAL GAS PURIFICATION ,РЕГЕНЕРАЦИЯ ,ВЭЖХ ,ОЧИСТКА ПРИРОДНОГО ГАЗА ,СИЛИКАГЕЛЬ ,HPLC ,ПРИСАДКИ ,SILICA GEL - Abstract
An analytical scheme is proposed for monitoring the contamination of an alumina-modified silica gel adsorbent in the process of purifying natural gas with TP-22C components of turbine oil. The objects of the study were the samples of both the fresh adsorbent and the spent adsorbent in the process of purification of natural gas. The identification of turbine oil components on the adsorbents was carried out using the thin-layer chromatography on Sorbfil plates by separating the oil components on the thin layer of the sorbent in an upward flow of hexane with the subsequent determination of their presence by the sulfuric acid : formalin developer. The determination of additives in the adsorbent samples was carried out by the method of reverse phase high performance liquid chromatography according to the technique that included two-stage extraction of analytes with the hexane and acetone solutions, their re-dissolution in acetonitrile, and the ensuing analysis. The highest content of turbine oil was observed in the upper and middle layers of the modified silica gel. The conditions for the extraction of turbine oil components from the spent adsorbent have been optimized. Various extractants and their volumes for the greatest extraction of turbine oil components from the adsorbent were studied. The stability of turbine oil additives on the modified silica gel was studied during its high-temperature regeneration by modeling the adsorbent regeneration process under the conditions close to production. It is shown that some components of turbine oil were resistant to the regeneration. For example, additives D-157 and V-15/41, the concentrations of which were comparable before and after the regeneration. The proposed analytical scheme for determining the components of turbine oil on the real adsorbent sample was tested. When determining the thermally stable components on the spent modified alumina silica gel, the mass of turbine oil accumulated in the adsorbent over the entire service life was calculated and amounted to 9.5 g per 1 kg of adsorbent.Keywords: natural gas purification, silica gel, regeneration, turbine oil, additives, HPLCDOI: http://dx.doi.org/10.15826/analitika.2020.24.3.002Yu.A. Ivanova, Z.A. Temerdashev, I.A. Kolychev, A. V. RudenkoKuban State University (KubSU),ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation, Предложена аналитическая схема контроля загрязненности компонентами турбинного масла ТП-22С модифицированного оксидом алюминия силикагелевого адсорбента в процессе очистки природного газа компонентами турбинного масла ТП-22С. Объектами исследования были образцы свежего и отработанного в процессе очистки природного газа адсорбента. Идентификацию компонентов турбинного масла на адсорбентах проводили методом тонкослойной хроматографии на пластинах Sorbfil путем разделения компонентов масла на тонком слое сорбента в восходящем потоке гексана с последующим установлением их наличия проявителем серная кислота : формалин. Определение присадок в образцах адсорбентов проводили методом обращенно-фазовой высокоэффективной жидкостной хроматографии по методике, включающей двухстадийную экстракцию аналитов растворами гексана и ацетона, их перерастворение в ацетонитриле и анализ. Наибольшие содержания турбинного масла наблюдаются в верхнем и среднем слое модифицированного силикагеля. Оптимизированы условия экстракционного извлечения компонентов турбинного масла из отработанного адсорбента. Изучены различные экстрагенты, их объемы для наибольшего извлечения компонентов турбинного масла из адсорбента. Исследована устойчивость присадок турбинного масла на модифицированном силикагеле в процессе его высокотемпературной регенерации путем моделирования процесса регенерации адсорбента в условиях, близких к производственным. Показано, что некоторые компоненты турбинного масла являются устойчивыми к регенерации, например, присадки Д-157 и В-15/41, концентрации которых соизмеримы до и после регенерации. Проведена практическая апробация предложенной аналитической схемы для определения компонентов турбинного масла на реальном образце адсорбента. При определении термически устойчивых компонентов на отработанном модифицированном оксидом алюминия силикагеле рассчитана масса турбинного масла, накопленная в адсорбере за весь срок эксплуатации, которая составила 9,5 г на 1 кг адсорбента.Ключевые слова: очистка природного газа, силикагель, регенерация, турбинное масло, присадки, ВЭЖХ DOI: http://dx.doi.org/10.15826/analitika.2020.24.3.002
- Published
- 2020
50. SOLID-PHASE CONCENTRATION OF PHENOLIC COMPOUNDS FROM THE AQUEOUS EXTRACTS OF HYPERICACEAE AND LAMIACEAE FAMILIES OF MEDICINAL PLANTS ON SORBENTS OF DIFFERENT NATURE
- Author
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Temerdashev, Z. A., Vinitskaya, Е. А., Milevskaya, V. V., Kiseleva, N. V., RFBR according to the research project № 18-33-20009-mol_a_ved, the Ecological and Analytical Center of the Kuban State University, РФФИ (проект № 18-33-20009-мол_а_вед), and ЦКП 'Эколого-аналитический центр' Кубанского госуниверситета.
- Subjects
MEDICINAL RAW MATERIALS ,ЛЕКАРСТВЕННОЕ РАСТИТЕЛЬНОЕ СЫРЬЕ ,FLAVONOIDS ,SOLID PHASE EXTRACTION ,SAGE ,ТВЕРДОФАЗНАЯ ЭКСТРАКЦИЯ ,ФЕНОЛЬНЫЕ КИСЛОТЫ ,ST. JOHN’S WORT ,ШАЛФЕЙ ,ФЛАВОНОИДЫ ,ЗВЕРОБОЙ ,THYME ,PHENOLIC ACIDS ,ЧАБРЕЦ - Abstract
The current work is devoted to the solid-phase concentration of phenolic compounds from the aqueous extracts of medicinal plant raw materials using the various sorbents for their further identification. Plants of the Hypericaceae (Hypericum perforatum L.) and Lamiaceae (Thymus serpyllum L., Salvia officinalis L.) families were selected as samples in this effort. For each of the sorbents, the main sorption characteristics («breakthrough volumes» and dynamic sorbents capacities) in relation to the target compounds, as well as their desorption parameters (concentration factor and recoveries) were obtained. Strata X and Oasis HLB polymeric materials allowed extracting the target compounds from the water extracts of plants at five-, and in the case of hydrophilic-lipophilic sorbent at 32- and 20-fold concentration. Strata C18-Е showed complete desorption of flavonoids (R ≥ 90%), but in relation to the phenolic acids, its use was impractical due to the low values of recovery analytes (R ≤ 40%). The Oasis HLB sorbent had universal sorption properties, which provided high concentration coefficients at acceptable values of recoveries of phenolic acids (R ≤ 96%) and flavonoids (R ≤ 91%). The sorption of phytocomponents with the Supelclean ENVI-Carb sorbent gave quite high characteristics, but the process of desorption of these compounds was difficult and requires further study. The use of the various types of sorbents showed that minor components that were not detected under the usual conditions of their chromatographic determination could be concentrated by SPE for their further identification, which would provide an extension of the range of definable compounds in various medicinal plants.Key words: St. John's wort, thyme, sage, solid phase extraction, flavonoids, phenolic acids, medicinal raw materials DOI: http://dx.doi.org/10.15826/analitika.2020.24.2.002Z. A. Temerdashev, Е. А. Vinitskaya, V. V. Milevskaya, N. V. Kiseleva Kuban State University,ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation, Работа посвящена твердофазному концентрированию различных типов фенольных соединений из водных экстрактов лекарственного растительного сырья семейств Зверобойные (Hypericum perforatum L.) и Яснотковые (Thymus serpyllum L., Salvia officinalis L.) с использованием различных сорбционных материалов для их дальнейшей идентификации. В качестве твердофазных сорбционных материалов использовали известные в аналитической практике октадецилсиликагель (Strata C18-E), сополимер стирола и дивинилбензола, химически модифицированный N-винилпирролидоном (Strata X), сополимер дивинилбензола и N-винилпирролидона, проявляющий гидрофильно-липофильную двойственность (Oasis HLB), а также непористый графитированный углерод (Supelclean ENVI-Carb). Для каждого из сорбентов получены основные сорбционные характеристики по отношению к целевым соединениям, а также их десорбционные параметры. Использование полимерных материалов Strata X и Oasis HLB позволяет извлекать из водных экстрактов растений целевые соединения при пяти-, а в случае с гидрофильно-липофильным сорбентом при 32- и 20-кратном концентрировании. Октадецилсиликагель показывает полноту десорбции флавоноидов (R ≥ 90 %), однако по отношению к фенолкарбоновым кислотам его использование нецелесообразно ввиду низких значений степеней извлечения аналитов (R ≤ 40 %). Достаточно универсальными сорбционными свойствами обладают гидрофильно-липофильные материалы (Oasis HLB), обеспечивающие высокие значения коэффициентов концентрирования при приемлемых значениях степеней извлечения фенолкарбоновых кислот (R ≤ 96 %) и флавоноидов (R ≤ 91 %). Сорбция фитокомпонентов непористым углеродным сорбентом Supelclean ENVI-Carb дает достаточно высокие характеристики, но процесс десорбции данных соединений затруднителен и требует дальнейшего изучения. Использование различных типов сорбентов показывает, что минорные компоненты, которые не детектируются в обычных условиях их хроматографического определения, могут быть сконцентрированы ТФЭ для дальнейшей их идентификации, что обеспечит расширение круга определяемых соединений в составе различных лекарственных растений. Предложенная схема ТФЭ фенольных компонентов может быть в дальнейшем использована для анализа растительных материалов других семейств.Ключевые слова: зверобой, чабрец, шалфей, твердофазная экстракция, флавоноиды, фенольные кислоты, лекарственное растительное сырьеDOI: http://dx.doi.org/10.15826/analitika.2020.24.2.002
- Published
- 2020
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